Calculate gravitational energy change
See this course’s project requirements
An energy-accounting notebook explaining work, stored energy, efficiency and three heat-transfer mechanisms in supplied desk scenarios.
Keep your working files in your own notebook or software. Save a private description, checklist, and work link in My Proof.
What to include
- Account for useful and dispersed stores within a boundary.
- Calculate work with constant parallel force conditions.
- Calculate gravitational energy change using supplied g and height differences.
- Compare efficiencies with the same useful-output definition.
- Classify three heat-transfer routes.
- Compare supplied thermal designs with limits and complete all changed cases.
Review and revise
Use these criteria to check your work and choose what to improve.
- Method: applies the course-specific rules to the supplied cases with visible intermediate work.
- Accuracy: results agree with the stated facts, units, boundaries and independent checks.
- Reasoning: explains why the result follows and identifies a limitation or unresolved question.
- Transfer: completes changed cases and revises the final project when a relevant assumption changes.
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The idea in everyday life
Fictional 2 kg object moves from height 1 m to 4 m relative to the stated floor. Suppliedg=10 N/kg, and no other energy store is analyzed in this step.
Near Earth’s surface in a uniform-gravity model, gravitational energy change is ΔE=m×g×Δh. The height is a change relative to a chosen reference, not always the absolute altitude. This course suppliesg=10 N/kg as a rounded model value; it is not an exact value everywhere. Use desk scenarios, not lifting tasks.
Calculate gravitational energy change — worked practice
Near Earth’s surface in a uniform-gravity model, gravitational energy change is ΔE=m×g×Δh. The height is a change relative to a chosen reference, not always the absolute altitude. This course suppliesg=10 N/kg as a rounded model value; it is not an exact value everywhere. Use desk scenarios, not lifting tasks.
Fictional 2 kg object moves from height 1 m to 4 m relative to the stated floor. Suppliedg=10 N/kg, and no other energy store is analyzed in this step.
1. 1. Height
Calculate the change rather than using final height alone.
You should see: Δh=4−1=3 m.
2. 2. Compute
Apply m×g×Δh.
You should see: 2×10×3=60 J increase.
3. 3. Reference
Explain what choosing a new zero height changes.
You should see: Absolute stored values can shift; the same three-meter height difference remains.
4. 4. Reverse
Describe returning from 4 m to 1 m under the same model.
You should see: Gravitational energy decreases by 60 J; other stores or transfers must account for it.
What to finish
An energy-change calculation with reference and approximation notes.
Watch for this
Actual gravitational acceleration varies and is not exactly 10 everywhere. Keeping the supplied approximation visible makes the numerical claim honest.
How can I tell I understand it?
Recalculate a changed mass and height difference without confusing altitude with change.
Quick knowledge check
Answer all 3 questions. Get at least 2 right and the lesson completes automatically.
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Answer all 3 questions above and get at least 2 right. You can review the explanations and try again.
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Source & access notes · checked 2026-10-01
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